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140 lines
4.1 KiB
C
140 lines
4.1 KiB
C
/*
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* Rufus: The Reliable USB Formatting Utility
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* MS-DOS boot file extraction, from the FAT12 floppy image in diskcopy.dll
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* Copyright (c) 2011-2012 Pete Batard <pete@akeo.ie>
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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/* http://www.c-jump.com/CIS24/Slides/FAT/lecture.html
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Ideally, we'd read the following from the FAT Boot Sector, but we have
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a pretty good idea of what they are for a 1.44 MB floppy image */
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#define FAT12_ROOTDIR_OFFSET 0x2600
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#define FAT12_CLUSTER_SIZE 0x200 // = sector size
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#define FAT12_DATA_START 0x4200
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#define FAT12_CLUSTER_OFFSET ((FAT12_DATA_START/FAT12_CLUSTER_SIZE)-2) // First cluster in data area is #2
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/*
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* Lifted from ReactOS:
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* http://reactos-mirror.googlecode.com/svn/trunk/reactos/drivers/filesystems/fastfat_new/fat.h
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*/
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#pragma pack(push, 1) // You *DO* want packed structs here
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//
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// Directory Structure:
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//
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typedef struct _FAT_TIME
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{
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union {
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struct {
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USHORT DoubleSeconds : 5;
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USHORT Minute : 6;
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USHORT Hour : 5;
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};
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USHORT Value;
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};
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} FAT_TIME, *PFAT_TIME;
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//
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//
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//
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typedef struct _FAT_DATE {
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union {
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struct {
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USHORT Day : 5;
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USHORT Month : 4;
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/* Relative to 1980 */
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USHORT Year : 7;
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};
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USHORT Value;
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};
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} FAT_DATE, *PFAT_DATE;
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//
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//
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//
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typedef struct _FAT_DATETIME {
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union {
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struct {
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FAT_TIME Time;
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FAT_DATE Date;
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};
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ULONG Value;
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};
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} FAT_DATETIME, *PFAT_DATETIME;
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//
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//
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//
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typedef struct _DIR_ENTRY
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{
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UCHAR FileName[11];
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UCHAR Attributes;
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UCHAR Case;
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UCHAR CreationTimeTenMs;
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FAT_DATETIME CreationDateTime;
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FAT_DATE LastAccessDate;
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union {
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USHORT ExtendedAttributes;
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USHORT FirstClusterOfFileHi;
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};
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FAT_DATETIME LastWriteDateTime;
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USHORT FirstCluster;
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ULONG FileSize;
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} DIR_ENTRY, *PDIR_ENTRY;
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// sizeof = 0x020
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typedef struct _LONG_FILE_NAME_ENTRY {
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UCHAR SeqNum;
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UCHAR NameA[10];
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UCHAR Attributes;
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UCHAR Type;
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UCHAR Checksum;
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USHORT NameB[6];
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USHORT Reserved;
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USHORT NameC[2];
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} LONG_FILE_NAME_ENTRY, *PLONG_FILE_NAME_ENTRY;
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// sizeof = 0x020
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#pragma pack(pop)
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#define FAT_LFN_NAME_LENGTH \
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(RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameA) \
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+ RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameB) \
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+ RTL_FIELD_SIZE(LONG_FILE_NAME_ENTRY, NameC))
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#define FAT_FN_DIR_ENTRY_LAST 0x40
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#define FAT_FN_MAX_DIR_ENTIES 0x14
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#define FAT_BYTES_PER_DIRENT 0x20
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#define FAT_BYTES_PER_DIRENT_LOG 0x05
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#define FAT_DIRENT_NEVER_USED 0x00
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#define FAT_DIRENT_REALLY_0E5 0x05
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#define FAT_DIRENT_DIRECTORY_ALIAS 0x2e
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#define FAT_DIRENT_DELETED 0xe5
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#define FAT_CASE_LOWER_BASE 0x08
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#define FAT_CASE_LOWER_EXT 0x10
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#define FAT_DIRENT_ATTR_READ_ONLY 0x01
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#define FAT_DIRENT_ATTR_HIDDEN 0x02
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#define FAT_DIRENT_ATTR_SYSTEM 0x04
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#define FAT_DIRENT_ATTR_VOLUME_ID 0x08
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#define FAT_DIRENT_ATTR_DIRECTORY 0x10
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#define FAT_DIRENT_ATTR_ARCHIVE 0x20
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#define FAT_DIRENT_ATTR_DEVICE 0x40
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#define FAT_DIRENT_ATTR_LFN (FAT_DIRENT_ATTR_READ_ONLY | \
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FAT_DIRENT_ATTR_HIDDEN | \
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FAT_DIRENT_ATTR_SYSTEM | \
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FAT_DIRENT_ATTR_VOLUME_ID)
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extern BOOL SetDOSLocale(const char* path, BOOL bFreeDOS);
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